Learning HTML
The items in this first section are visual and interactive demonstrations of concepts in HTML. The resources in the second section, pulled from an up-to-date version of Awesome HTML5, are part of a more complete summary of HTML learning resources. Also see this web book's Online Learning Overview and Massive Open Online Courses pages, which emcompass HTML (but also other topics') resources as well.
Select Interactives and Visualizations
HTML & CSS is Hard (But it Doesn’t Have to Be)